Hugo borchabdt



(N0 Model.) A 2 Sheets-Sheet 1.

H. BORCHARDT.

SPEED REGULATING DEVICE. No. 246,366. PatentedAug. 30,1881.4

Hill m Pneus, Pmmumugmpmr, wuhingnm D4 c.

(No Model.) Q 2 sheets-sheen 2.

H. BORCHARDT.

, SPED REGULATING DEVICE.

No. 246,366. Patented Aug. 30,1881.

1H f1 Im l Imm Unirse STATES v'lja'rniwr Ormea.

HUGO BOROHARDT, OF NEV YO-RK, N. Y.

SPEED-REGULATING DEVICE.

SPECIFICATION forming part of Letters Patent No. 246,366, dated August 30, 1881.

Application filcdJunc14,1881. (No model.)

To all whom it may concern:

Be it known that I, HUGO BoRcHARD'r, of the city and State of New York, have invented certain Improvements in Speed-Regulating Devices for Sewing-Machines, of which the following is a specification.

My improvements relate to that class of speed regulating devices heretofore extensively employed in connection with sewingmaehines in whiohethe operator is enabled to alter the speed of the machine without stopping it by holding` a lever in variable positions.

In such devices heretofore the treadle has usually been provided with arctracting-spring, and thevariability in the speed of the machine has been attained by pressing the treadle against the force of the spring with diiferent degrees of force, so as to hold the spring in a more or less compressed condition.

One distinctive characteristic of the mode of operation of my improvement is that the treadle for altering the speed of the mechanism is not worked against a spring, and therefore keeps any position in which it may be placed, so that continued pressure upon the treadle is not required in order to preserve the speed of the machine at any given rate.

My invention consists in the combination of a treadle with means for transmitting power to the counter-shaft, carrying the pulley to which the machine is belted, consisting of a friction-disk atliXed to a longitudinally-movable shaft and rotating upon an axis at right angles to the axes of the counter-shaft and of the line shaft, and bearing upon opposite sides of its periphery against thel faces of two disks, respectively aflixed to the counter-shaft and the line-shaft, the face of the disk of the counter-shaft being held against the periphery of the intermediate friction-disk by elastic pressure. The shaft upon which the intermediate or transfer disk is mounted is so con nected with the treadle that it may be moved longitudinally in either direction by rocking the treadle. The movement of the transferdisk toward the axis oftheline-shaft diminishes the diameter of that part of the disk upon the line-shaft which drives the transfer-disk and increases the diameter of that part ot' the disk upon the counter-shaft which receivesits motion from the transfer-disk. On the contrary, when moved in the opposite direction, the diameterof that part of the disk upon the line-shaft which acts upon the transfer-disk is increased, and, on the other hand, the transfer-disk acts upon the disk on the counter-shaft at a point nearer its center, and thus increases the speed of the counter-shaft. lhe transfer-disk remains in any position in which it may be placed, and the speed of the counter-shaft, and hence the speed of the machine, is therefore constant so long as the treadle is not moved. The frictional hold of the transfer-disk upon the disk on the counter-shaft is maintained by an expanding spiral spring` on the counter-shaft` which constitutes a part of my invention. In case of a sudden strain upon the machine this spring will yield and allow the transfer-disk to slip over the surface of the counter-shaft disk. In connection with this spring', and to enlarge the capacity of the machine to which the apparatus is applied, I arrange a withdrawinglever, which can be,if desired, connected with and operated by the treadle-shaft.

In doing a class of work in which no systematie variation in the speed of the machine is required, I may disconnect from the treadle the shaft of the transfer-disk and connect it with the withdrawing-lever, by the action of which the disk on the counter-shaft is withdrawn from contact with the periphery of the intermediate disk whenever it is desired to stop the machine.

My speed-regulator maybe usefully employed for sewing-machines or for any other class of partially-automatic machines in which the services ot' an operator are required, and in which contingencies are liable to arise requiring variations in the speed of the machine.

The accompanying drawings, representing my speed-changing mechanism, are as follows: Figure l is a top view. Fig. 2 is a front elevation, partly in section.

The drawings represent a line-shaft, A, for rotating continuously at a given speed. The line-shaft is provided with a disk, a, the side of which engages the periphery of the transferdisk b, the shaft of which is seated in an arm, b', affixed to the longitudinally-sliding bar B. The periphery of the transfer-disk b is preferably covered with leather or some other par- ICO tially-elastie material. The transfer-disk is rotated by the engagement of its periphery with the face ot' the driving-disk a.

Thecounter-shaft G is provided with the disk c, which, it will be seen, has a dished edge, c. The object in dishing the edge ofthe disk c is to release it from engagementwith the periphery ofthe transfer-disk Z1 when the transferdisk is pushed inward to a point opposite the dished part ot' the disk c. When the position ofthe transiter-disk b is such that it engages both the disk a, and the disk c the countershaft C is rotated with greater or less speed according to the ratio of the distances ot` the axes ofthe disks a and c from the points ot' their engagement respectively with the transfer-disk b. rlhe counter-shaft is provided with the pulley C for engaging the belt wh ich drives the machine. The expanding spiral spring c2, surrounding the counter-shaft C, bears at one end upon the washer c, supported against the end ot' thejournal G3, and at the opposite end hears against the clamp-collar cl and thrusts the disk c into the position in which it is rcpresented in the drawings, in which, as will be seen, the transfer-disk is pushed inward to a point opposite the dishing part c of the disk c, and is not in contact therewith. Vhen the transfer-disk is pulled outward, so as to engage the face ofthe disk c, the spring c2 yields, allowing the disk c to move back.

The sliding movement ot' the transfer-disk is effected by' moving the slide-bar B, to which the arm b is athxed. This is eti'ected by means ot' the rocking lever B, the slotted end B2 of which loosely engages the pin b2, projecting downward from the hub D of the arm b', in the upper end ot' which the shaft of' the transferdisk b isjournaled. A spring, D, attached to the end B2 ofthe lever B', tends to push the arm b over, so as to remove the transfer-disk from contact with the driving-disk a when the transfer-disk is opposite the dished edge ot the counter-shaft disk c, and the machine is not in use.

The oscillation ot' the lever B is eiiected by means of the treadle D, through the pitman B3, affixed at one end to the end B" ofthe leverB, and at the other end to the pin d,inserted transversely in the arm d, projecting upward from the hub d2, through which the treadle rockshaft D passes, and which is provided with a set-screw, d, by which it may be fastened to and made to move with the rock-shaft D.

In some classes of work in which it may not be necessary to vary the position of the transfer-disk from that in which it imparts a prescribed speed ot' rotation to the counter-shaft, and in which the spiral spring e2 affords all the necessary protection against a sudden strain on the machine, the hub d2 may be loosened from the treadle rock-shaft D by unscrewing the set-screw d, and themotionofthemachine may be arrested, when required, by means of the withdrawing-lever E, provided at itsinncr end with the upward projection, c, carrying the brake-block o', which is made to bear upon the face of the disk c, and to push the disk backward out of engagement with the transfer-disk by means ot' the rocking-lever E, one en d. E2, of which is seated in the curved recess El, formed in the edge of the withdrawing-lever ll, while the other end, E4, ofthe rockinglever, l l,is connected by means ot' the pitman E5 with the pin. F, inserted transversely into thc arm j', projecting upward from the hub j" The treadle-shaft 1) is inserted through the hubj", which is provided with the set-screwf, by means ot' which it can be fastened to and made to move with the treadle-shaft D.

lt will, ofcourse, be understood that when the transfer-disk is to he used for varying the speed ofthe machine the set-screwfZ will be loosened, so that the rocking ofthe treadle-lever will have no eiiect upon the train ofmcchanism which actuates the withdrawing-lever; and, vice versa, when the withdrawing-leveris to be used, the set-screw di* will be loosened, in order that the treadle-lever may not act upon the hub d2, which actuates the system oflevers for changing the position ot' the transfer-disk.

I claim as my inventionl. In a speed-regulator for sewing-machines and other purposes in which power derived from a disk affixed to the line-shaft is trailsmitted to a disk affixed to a parallel shaft having the capacityof endwisemovement,a transfer-disk rotatingupon an axisperpendicular to the axis of the other disks, and in the same plane, and having the capacity of axial movement in a path midway between the other two disks, in combination with a rocking lever, and a treadle connected with the rocking-lever, Yfor the purpose ot' imparting axial movement in either direction to the transfer disk, thereby varying the position olil its points ot' cu gagement, respectively, with thc disk on the line-shalt andthe disk on the counter-shaft, substantially as for the purposes set forth.

2. The counter shaft C, provided with the spiral spring c2, and having ai'l'ixed to it the disk c, in combination with the transfer-disk b and the driving-disk a., substantially'as and for the purposes set forth.

3. rI he disk c, upon the counter-shaft C, provided with thc dished edge c, in combination with atransfer-disk b, and means for moving the transfer-disk b in a path perpendicular to the axis of the counter-shaft (l, substantially as and for the purpose set forth.

4c. lhe transfer-disk b, journaled in the upper end ot' the arm b', allixed to the slide-bar B, in combination with the spring b", and means for moving the transfer-disk b into or out of a position opposite the dished edge of the countcrshaft disk c, as and for the purpose set forth.

5. rlhe counter-shalt C, having` the capacity of endwisc movement, and provided with the spring c2, in combination with the withdrawing-lever E, carrying the brake-block c, and means, substantially such as described, for 0peratin g the witlulrawing-lever for the purpose of disen gagin g the face ofthe disk c from the IOC IIO

gagement of its periphery with a constantlyrotating disk, and operatin g to drive a coun- 15 ter-shaft by the engagement of its periphery With the disk affixed to such counter shaft,

a spring for holding such counter-shaft disk against the periphery ofthe transfer-disk with a yielding pressure, substantially as and for zo the purpose set forth.

HUGO BORCHARDT.

Witnesses M. L. ADAMs, WM. RUMBLE. 

